When Justin Smith decided that his body wouldn't let him perform up to his own lofty standards, he knew it was time to stop playing.

Smith announced Monday he is retiring after 14 seasons as one of the top defensive linemen in the NFL, dealing yet another blow to the San Francisco 49ers in a rough offseason.

"They all want you to keep playing, and I want to keep playing as well, but when you get on the bald tires, you're on the bald tires," Smith said.

One of the most durable players at one of the most physically demanding positions, Smith had been hampered the past two seasons by a bum left shoulder that he first hurt in training camp in 2013.

That shoulder absorbed the brunt of the punishment as a right defensive end going up against 300-pound linemen, and Smith did not feel up to playing another season.

"It doesn't respond like I want it to respond anymore," he said. "If you don't have the tools, you can't do the job. It's time to go."

Smith had just two sacks in the final 14 games last season as his practice time, snap count and effectiveness dwindled toward the end of the season.

Two other 49ers defensive stars have also retired this offseason in linebackers Patrick Willis and Chris Borland.

... An advisory group appointed by Mayor Kevin Faulconer recommended that the Chargers contribute $300 million toward a new $1.33 billion stadium, with the NFL giving $200 million, the city and county $121 million each and personal seat licenses totaling $120 million.

Under intense pressure from the team and the NFL, the Citizen's Stadium Advisory Group said in its financing plan that there won't be tax increases or increases to the city's general fund, and that the financing plan doesn't rely on development to pay for the stadium, parking or infrastructure.

... Ryan Tannehill signed a $77.7 million, four-year extension with the Dolphins that keeps him under contract through 2020. ... The Saints signed veteran receiver Josh Morgan.

golf

Minjee Lee wins Kingsmill title

Minjee Lee shook off a three-putt bogey on her first hole with two finishing pars and won the weather-delayed Kingsmill Championship by two shots Monday, her first victory on the LPGA Tour. Lee, an 18-year-old Australian, finished at 15-under 269. She surged into the lead on Sunday with a round highlighted by a five-hole stretch that she played in 5 under and returned to the Kingsmill Resort's River Course on Monday morning with a four-stroke lead. She three-putted her first hole, the 16th, but rallied with a pair of pars.

So Yeon Ryu started her day with three consecutive birdies and finished second, with Alison Lee another shot back. Third-round leader Perrine Delacour finished fourth after a 71.

horse racing

Pharoah has leisurely day

American Pharoah took a short walk to stretch his legs after his flight before getting a bath and retiring to his barn for some well-earned rest. There was no sign of jet lag as he returned to Churchill Downs following his dominant Preakness victory that put him on the cusp of capturing the Triple Crown.

Pharoah assistant trainer Jimmy Barnes said "everything went well" during the trip and added, "He's a very good shipper." He will have light work this week after arriving Monday afternoon from Baltimore.

around the horn

WNBA: Phoenix center Brittney Griner said she accepts the WNBA's seven-game suspension following her arrest in a domestic violence incident.

College football: Former Notre Dame quarterback Everett Golson reportedly delayed his decision to announce where he's transferring and could take additional visits to other schools. Golson was expected to declare where he was transferring to Monday.

ASSOCIATED PRESS